She pouts upon discovering that Barnaby is married, however, and after his return to the lab, Barnaby falls asleep. Barnaby flirts with Miss Laurel as they race, then roller skate and swim, and she rewards him with a kiss on the cheek.

Next, at the car dealership, Barnaby purchases a sports car, and asks Miss Laurel, who has been sent to find him, to go for a ride. Overcome by a feeling of euphoria, Barnaby leaves the laboratory and has his mature haircut changed to a more youthful crewcut, then buys a loud, checked sportscoat. Soon Barnaby notices that his bursitis no longer hurts, and that he can see without his thick glasses. Jerome Lenton, Barnaby swallows the formula, and its bitter taste forces him to get some water from the cooler. Just before Barnaby returns, Esther pours her chemicals into the water cooler, after which Barnaby mixes his own batch. Barnaby begins work, but when he leaves the laboratory, Esther frees herself, and copying Barnaby, mixes a batch of the ingredients for his formula. Oxly's hopes are raised when it appears that the aged Rudolph is bounding around like a youngster, but it is revealed that Rudolph's numbered uniform was inadvertently switched with that of the younger, mischevious Esther. Oxly shows Barnaby the ad campaign he has devised for the formula, which he has named B-4, but Barnaby urges him to be patient. The elderly Oxly hopes that Barnaby's formula will be financially successful, and will enable him to pursue his curvaceous secretary, Lois Laurel.

One morning, when Barnaby arrives at the Oxly Chemical Factory, where he works as a free-lance scientist, he is summoned to president Oliver Oxly's office. Barnaby is encouraged by his wife Edwina, who loves her brilliant husband despite his eccentric behavior.

Absentminded scientist Barnaby Fulton is discouraged when his formula, which he hopes will reverse the ill effects of aging, proves ineffective on his test chimpanzees, Rudolph and Esther.

Monkey business game horror